Tube rolling mill



May 3Q, E939, M LANDRIEU TUBE ROLLING MILL Filed Aug. 13. 1936 Patented May 30, i939 UNITED STATE-s' PATENT OFFICE aman 'man Bouma mu. Max marien, rsi-n, mne, assigner to societe,

Anonyme dliscaut intense,

Anxln, France, a

corporation France puncin-Anm 1s, me, sei-n1 No. 95ste In France lFebruary 27, 1936 achim. (erst-14)- 'Ihis inventionrelates to tube rolling mills in l which therolling is eil'ected i'n the well 'known manner by means of external rolls-and of an internal mandrel which carries the tube blank and s is arranged to-receive a to-andfro movement towards and away from the rolls and to4 be rotate'd about its axis when moved in one sense.

` The reciprocation oi' the mandrel is usually arranged to be eii'ectedby .piston mechanism in comprising a rod member moving with the mandrei and vprovided with a'steep-pitched external lscrew thread 'adapted to cooperate with in ternally screw-threaded rotatable nut inv such a manner that-'during thereciproca en oi the l5 Urodmeinber in one direction the nut is prevented 'from' rotating by a pawl and `ratchet mecha- .nismso asto cause the rotation of the rod mem- "ber andthe carriage through one quarter oi' a -revelution.-'while during reciprocation ofr the rod go'm'e'mber in the opposite direction the nut is free j toI 'rotate' and the rod member moves longitudinelly withoutfrotation. With this arrangement winne-evident meneur-cumplen to-and-rro inovements of -the rod member-and the carriage -25 androlisfamounted thereon is required for eiiectingonerevlution 'of these elements of the ID,-

W -g hepresentinventionhas for its object to providearrangements whereby tube rolling ap- 3Q paratus'of'the kind above described may' be utij I to-produce a tube' oigcireuiar cross-section 1 jalons any desired portion or'portions of its length and ofi a' different non-circular special proiile` along-anotherportion or portions thereof,

'L According 'to the invention-ine wenn of the --nutcooperatinggwith .the' screw-threaded rod I' .member toproducerotationof this member is f supersededbyiany-sintablemechstage oi ;.the rolling opera corresponding pronle,

Figure'3fisanQeIevationaIview'of-one type of j Figure Safisarf y ienal view of the: tube taken 'portion-ot the. tube is tohave sinon-'circular Yproille,"thisbeing ;produced by providing -rolissbnthe 'f carriage lo! a meh anim Figure 3b is a sectional view oi the tube taken on the line IIIb--IIIb of'Fig. 3.

Figure 4 is an elevational view of anotherrtype of rolled tube. Y

Figure 4a'is a sectional view of the tube taken I5 on the line Iva-Iva of Fig. 4. Figure 4b is a sectional view of the tube taken on theline IVb-IVb of Fig. 4.

Referring-now to 'Figure 1, n wiu be seen that the mechanism for reciprocating the carriage l0 S(not shown) comprises a piston I rigidly connected at one side to a driving shaft 2 for the carriage and at the other side to a rod member l having an external Ascrew thread oi one quarter turn; An internally screw-threaded nut 4 is 13l mounted on the rod member 3 and is' provided -with a central circular ilange 5 constituting a ratchet wheel and provided with ratchet teeth i, the iiange I being'located in a chamber I formed in the cover-plate l of a cylinder 9 containing Q0l o the piston I, so as to prevent axial movement of'thenutl- Y In the chamber 'I are arranged pawls Il which,

in the exampleshown; are three in number, and

are carried bythe inner-ends'of rods Il provided g5 with control springs I2 abutting against collars I3 formed fon the rods II.

The upper-ends of the rodsl IIv are provided with projecting keys I4, the ends of which are kalways in contact with ramps I5 formed on a 30 curvedmember Il concentrically arranged on the cover land capable oi' being circumferentially displaced thereon by means of arms I1;

" -The extent of such displacement of the member -II Is limited. bythe engagement of stops Il pro- 35 vided'at' the ends of the member I6 with the sides o raproj'ection It on the cover plate l and I in thel body of vwhich are provided the necessary bores furthe-rods iloithe pawls IU.

ASo long as thefparts'occupy the position shown 40 Y in lFigures.1'ax1e l"2, thekeys Il'on the rods II engage thelowestparts of theramps lion the member Il, the .-springs I2 acting onfthe collars I3 onthejrodsIltwillcausethepawlsllltoengage with the teeth@ o f the ratchet flange 5 on the 45 'nutlz 4 As a result, during the forward reciprocation ofthegplston I, the screw threaded-rod Il in nut l which is'prevented-frmfi'otatis in a corresponding direcabout of a -jr'evolution and carries with it theilinn themandreL the reciprothe rolisjmoimted thereon.:v tiene! these parts in the nutitgis unautnon byithefpwls-Ile afordzto rotaie throughY ,5.

rotation of Ithe parts above referred toso that under these conditions the apparatus operate in the ordinary well-known manner.

If, on the contrary, the curved member II is displaced in thedirection of the arrow j, the

keys I4, being forced outwards by the ramps II, carry the rods II outwards against the action of the springs I2 which are compressed. The pawls I 0 are therefore disengaged from the teeth 6 of the ratchet flange l on the screw nut 4 which, as a. consequence, is freed. During the reciprocation of the piston I therefore the nut 4 does not exert any action upon the rod member 3, which together with the piston, mandrel and carriage. is merely given a longitudinal to-and-fro movement. The tube under these .conditions is thus rolled to the prole corresponding to that of the rolls through which it passes.

If the curved member Ii is now displaced in the direction cf the arrow f1, the pawls Il, under the action of the springs I2, again come into engagement with the teeth i of the ratchet iiange 5, so as again to restrain the nut 4 and to cause the screw thread rod member 3 during its forward displacement to turn through one quarter of a revolution.

Figures 3 and 4 show, by way of example, various proles of tubes which can be obtained by the arrangements described above.

The circular part a is obtained by the restraining of the nut 4 so as to compel the rod member 3 to rotate during its forward displacement.

The'proiiled part b is obtained when the pawls Vangelofthenutlsothatthemq Il aredisengagedfromtheteethlonfheratchet member] and its attached elements are merely givm a longitudinal to-and-#fro movement. It willbe understood that the invention is not limitedl to the production of the 'tube profiles shown in Figures 3 and 4 and that without exceeding the scope of the invention, it is possible to obtain any special profile desired by utilising the arrangements above described. Y I-claim: Y

Inatuberollingmillforrollingtubesbetw a internal mandrel and external rolls, a cylinder,

` a piston arranged for reciprocation in said cylinder carrying a screw with a single pitch thread and adapted for.driving the mandrelLa cover plat for said cylinder, a single nut in engagement withs'aid screw housed within a chamber in the cover plate, means permitting partially vaned tubes to'rotate during working passesof the nonvaned parts comprising ratchet teeth on 'the outer periphery of said vsingle nut, pawls adapted for engaging said teeth and a member with ramps shiftable about the axis of said screw and adapted for separating said pawls from said teeth in orderto stop the rotation of the mandrel for rolling a tube part of non-circular section, and means carried by the cover plate adapted to be engaged by said member so as to limit the shifting thereof. i

MAX IANDRIEU. 

